20388893 has 4 divisors (see below), whose sum is σ = 23301600. Its totient is φ = 17476188.

The previous prime is 20388883. The next prime is 20388947. The reversal of 20388893 is 39888302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20388893 - 2⁶ = 20388829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20388893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1456343 + ... + 1456356.

It is an arithmetic number, because the mean of its divisors is an integer number (5825400).

Almost surely, 2^20388893 is an apocalyptic number.

It is an amenable number.

20388893 is a deficient number, since it is larger than the sum of its proper divisors (2912707).

20388893 is an equidigital number, since it uses as much as digits as its factorization.

20388893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912706.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 20388893 is about 4515.4061832796. The cubic root of 20388893 is about 273.1898432200.

The spelling of 20388893 in words is "twenty million, three hundred eighty-eight thousand, eight hundred ninety-three".